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Vacuum-drying and freeze-drying were adopted to improve the catalytic activity of Ce 0.5 Pr 0.5 O 2  for soot combustion. The specific surface area and pore volume of the as-prepared Ce 0.5 Pr 0.5 O 2  were greatly increased compared to the counterpart using the common drying method. Furthermore, the redox performance and the oxidation ability for soot were enhanced, as demonstrated by H 2 -TPR and soot-TPR. Thus, lower combustion temperatures and higher intrinsic activity were obtained. This work demonstrated that simply changing the drying process of precipitates can be served as a paradigm to improve the structure and catalytic performance.

Improved Intrinsic Activity of Ce0.5Pr0.5O2 for Soot Combustion by Vacuum/Freeze-Drying